representative robin kelly won the democratic party's nomination to succeed former congressman jesse jackson junior. in washington today, the vice president pointed to her pledge to fight gun violence in a city rocked by a record number of deadly shootings. >> the voters sent a message last night, not just to the n.r.a. but politicians around the country by electing robin kelly who stood up and stood strong for gun safety. totally consistent with our 2nd amendment rights. they sent a message. >> reporter: mr. biden also met with new york city mayor michael bloomberg, whose super-pac spent two million dollars in ads that attacked candidate kelly's opponents for their n.r.a. support. >> brown: online, we have extended coverage of the gun control debate, including new data that reveals some common ground on approaches to stemming gun violence. >> ifill: now, to a debate over where and how we work. this week, marissa mayer, c.e.o. of the tech giant yahoo! announced the company will stop its employees from working at home. the move made headlines around the country, sparking conversations about w